Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0bde69e296caca9977862f3edb4eead4e8675da9a5fcdea2052f6db0ad8388' 
  AND token = 'N0h0dG2+4ApN4ItEoPQJv99H5XODlEiFDHjKPrvvpDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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