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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b0c57ec871ee95d47a58217b29b951122ff94119ec2cdca83d71a70bbdc0db27' 
  AND token = 'CMkhIyUd1Yppc8kto0VWZo9KX4YlnrPI0Ys7pBYvRL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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