Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c17fe1519a6837924eef2a07a95c6b01b95b55d4ded5a3a0e451bae46d390c9' 
  AND token = '9W0FcZ8ttCiVNiiPYZKV8tCjD8TTZkJUZ4Jf46hB+d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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