Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d2fdab2cdafa74c318ff66ffde7cbc3a9598cf9300c0b1710afd06dcbe7c83' 
  AND token = 'LsV2WT3XAuVp+VSwv+MA0zgKJW1TtByNL7uSLhe7hXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}