Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85cbbb2e31b249d1946b889ec15bc305c9a20d2fb6164ee9ffcf09f8e1ed7aa' 
  AND token = 'T8+em95eTCQTIZVPawORvPPzAcjR4CybpqKI9zciEBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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