Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93996f645c07ae8faf5de449b647d2b03ef45ff709b19a71153ac2e45648232' 
  AND token = 'G7nQ1NCOAMAmPfBmvRrlk2TtS7wxgTxHSSb8K3Osbrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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