Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcb368069cdaa6f74cfe0a7b5e7263f95e6ca5abcdffefc686cd9ab743ceb3f' 
  AND token = 'Rt2juKnsfrqbcyqk0bfwsAob2jvq0wRMqozXFEFkRLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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