SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53ee568034c9afcfccf84d437980085c96e4c515fb32abb58897f32a278e5f3a' 
  AND token = 'hZv+VSoJU6Ejc2XYJKwXmTfoMzsX+27OnIgKFmlOPKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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