Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dfdb7e59513ac441610252023c1ed0ec793d54198757aaaf42e2cf9f518e6d' 
  AND token = '1VtpYqQc49Hk4shHNZ0EJBRsaAqdaBZaQ3GFZP/5Xf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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