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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '635e2d9f1b96b450f730e64a28c5bd9df98131930a71c9639e9eec163cb667ae' 
  AND token = '20P6QeQHQo2iUw6v2slBGwol9RxIAeHdemU9x9igvgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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