Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bbcef7b79da9552b2eabdf66593a98e2c35b1a0c7d7305660084598e451b91' 
  AND token = '3l6lNkKYOC0Ha0aiIo65FtVGsXG2VQaAPta590/GKy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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