Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6caa5a1529c0624162a7415081329ad4abf6cf691ffcfc5e71e982a4801fcd' 
  AND token = 'KCYluRvpMo45RSrUCL9sCNvtraLjTSmTD52MQdCajtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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