Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7b39611c68870006dc11f59555c66ad9ffdebbc213ff47ec82c4b9c13ec8f0' 
  AND token = '9HdYKVQne6Vs/TNy8J3h9HANKa6BzjMsLQnevOtre+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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