Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea1394b38b2e90e26efac595e8bf25b0419e670ae1e65a26631159b7bf89450' 
  AND token = 'u4b+dcIAKxAkzr3b6WHQWQkat09FuMlmeIi7OCItONw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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