Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4eaef87ae779c95018d7a9bb5d73df430d121f35111a0c61e498ce90686391' 
  AND token = 'Fi/0Z5SaPVfF6MbMb5QvAXcRzWpOHbPAwR02I6adR4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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