Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39446db2623fa1169120cb3e90d4b28d6167952e41e81a1ff4c68dbf2e3f1e3e' 
  AND token = 'g+FrAeHYbhOhWcvWLdNVN/A6g0tU5SUq1zIPmWM4wWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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