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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3717bfbbd911f07e498eeb406eb5ae7b4b6db1795ecdf32d9ecfd10f9ba8e6fe' 
  AND token = '1kVMTgpYNLVSxn6eC1NUfMvZicOgYM5QbjO3lYMk1Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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