Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1e169f02f210bdc818092e590a2981873a04c4ef6cd0b4c22191b017ed3d08' 
  AND token = 'L4wnxqLGX3tuW/JurRlYua0Py4SnOsWds6bO4LIaIdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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