Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940dc81c5a9724bc382a887440b5244d833ce60b93c272f244363c9c54f25b15' 
  AND token = '93AklwGXilf7bCr26ynJPLn4RXKa0JDBL2da02X2A2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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