Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d51981fac186ef5c2d2ab92415f0a1f68a356f3501acf2309455f6a3a7767b6' 
  AND token = '4T2At8agBWNKF43nh/JrGe98g9gaqiRHgDHukKF00X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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