Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35dffdafa0dab1c29db80989fbfc2b66fa2d58ba794314bc5a69db0380f6652' 
  AND token = 'd+2Rb/Jf4sGmQcvmOkasQAufPuQyjCUztbEiUizJ5lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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