Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67892083f04b3826dc5d909e2a31259934510b83d2c2080136f9b0ccafab846' 
  AND token = 'NFvOf/hA3i7frF65nqZLjvraDXcYfQKFitFDD0Hc4Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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