Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a460b47ecb82b4751ee78b9ea4f66138fcc2c6ad155e73b8dd7b2025ad7996b' 
  AND token = 'QbO9ziLzfWT+B2i+9IqjQTxxO7HuM2M2gnSEWnxeE9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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