Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6e2de66b08a921ed68ffbda21ef3121e21bb7493a8397cddea55d3df52ebd5' 
  AND token = 'MjFgIROwqy4hpIG5u+GtWTCTx3qqQ6t85Ujt3m2Pp9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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