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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '21ecab709943db4d4bb1fb7c9a45894e748a736c407f771b928b9f6db409bce3' 
  AND token = 'eNI6wKEktyVVaKxS8Gw7cIRY8uKhDJEk48/gOmcmu4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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