Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c5692d9c8e4bca27db253dba24ec15cf9c5fca30e8cd3e31037af81f40dfe4' 
  AND token = 'L5M3EbokhVT2OSJH2muZSsIcooyTCPEBo135WvYPomE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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