Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5eaa9fc18febb0302d079c4d9644cbd6b400fe1e139e9b8b290f623285ca79' 
  AND token = 'e6TYJ1/gAeOq7OXB8xJ+bUEWJm2poT27SCllX5UHOV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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