Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f1f91d20dec95dea557d530c12f3c5e027cddf44c5afd9529830e9378ad99f' 
  AND token = '1U9Gqy7xGdlXAIVsNn2b2ZTAl1TuUs4FOD422XN4CmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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