SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47cb9117722216997d10ec405a52c3afca10f9f53e97f52b043ff74b3501d32f' 
  AND token = 'jOTNPvyHKPEBfpEA0E6LqiwTkHVfV6O+HUNGdqIYCto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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