Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f924a6c18b16d4a91aae6f7e028f854c6f53f5080e9468c6b51d1c38e285b3' 
  AND token = 'mM4SvK5BSNsDFuHTQun3+HHRR6UyZUDxcwFDEouGiy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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