Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8c67d1995392a670d85e552d5fd4906abb55b8d4ce3394facb510ad77eafac31' 
  AND token = '3sG406AH3Gn3bLghiZTgsTaS4Mn8bM3eYXihAR4I0ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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