SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd66f45abfa02cd8179c79b62fcdf8347dc40ea5d488a0dc0278a1c0899fd4330' 
  AND token = 'gktCjkZn8g0jUwY+4hgvQDKn/zG0BpcST2/TS75rBPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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