SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93d0801632650575c2096e1bd3bf6746960d7ef8583a3f15f87f649cd980b379' 
  AND token = 'gEhUZpdU0k9/y1vrVm9x9q6KYMNQ5Km7gdRnHlDRLWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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