Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48f330c4b87daf94427add868a33501ea665a9cf3f100d8432418b61eb24ca9' 
  AND token = 'kQz5MVDax3T7NDT0gi4IV79tB63maNnjJdB09vqzXDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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