SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ca1099f5b3cda51519dd7e223713589123986f2fcb5cdf536b666c9e3bdd9d8' 
  AND token = 'C3hQUsRKq84y2X4D0kUSTMJ/PIpx61NlqkAUj1EgZaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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