Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ed3e97f94c1eb8aafc2cbfb7f2b79a985c9e5dcdb8115a94eed8c01c82d62c' 
  AND token = 'vm20/nSVzPCX7v8t1J1dvSLplVmP19lklaxIjg4h6Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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