SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'baede05731f001ab903b5f0992258e5a578f079e54c148b2d1aeb96687bbc1f8' 
  AND token = 'zKiOttA5hKJYXrBTMO4sHD8cv7em1Rl2gIBbKmqDffU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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