Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac14adbf8b91aaa43299d18a6ad9999e587964697a0ca76041bb4a0aafc9e65' 
  AND token = 'M4JWTtRKMclZkpZSTy4gOGuLy5rNhFJ3FCBo0u4E+TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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