Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e2173ba8b60b1fda0c8c6d66bdd454a19e9ff6204a36bebbc4678418ad6dc9' 
  AND token = '5ULLWXImvhysNiyTkq8ky2vfWIpFqThDUd3GU5ZT//E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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