Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7191c9db1fd6203eea0b50134f21137efa3e3986bb4dde7777e1bb75c5c1716b' 
  AND token = 'EI3DiCDCxsJRXaN9734Hd0ZrnWYx1MW3Uod96O5RDKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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