Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e0204a6dcb3c22974da1a292b8c21ba55db0f9647d4b064e9d548701912de9' 
  AND token = 'z/xHE/UJ7ndDdKBzwp79F8aY2AXxZxf40fdMOFsE5qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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