SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ad49f9bada034bd7ea1ec573432f494803b600402ce80d26867e3f41b2d6690' 
  AND token = 'FhlI9zWxqTWwknJ85UGRqrTLwBGkiTb9ZbQyoQ9AU5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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