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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '67fd82acf4807c064705cfb337b33962cc275dc0446318cea78228bd4c3dbcbc' 
  AND token = 'JX0x96OQLthUVftJarDtOMw0YT9zM6usj9avPj5hiQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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