Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c6388b6acb1ef78d5aa11bc15f2dd80c4ca9b4b607c502f67701f815f3d0f5' 
  AND token = 'iPahJfrPMqzf0dKfcCwec7g7DWM8QMPcwP/tb88dWCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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