Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20a6f52f8679388dca2a4b4da472273b5b4571db49275ede7f88b243ef1bbf27' 
  AND token = 'RPbJcQ8Byc2pFBIg2uRHrlHL+YAAkuxEt+kLTuLnsvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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