Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c904a54e16f905cb46a11c5628b5d8212e0b975ecdc8e0f1d19c42c9569d6b9' 
  AND token = 'GB93aZOjOhhFbJu1eTYDhS5IcjcplKmexQ1xRmRkWDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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