Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2c03d2c750c8548afa2aac969e91a2e671ecb7568e0da46874c8c159b88d2c' 
  AND token = 'yXkiuJp/4/iD3gWfLRq7ruDYU8aXgAG+8HcXM1ZtIn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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