Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f46d84ca0fea19d0fdf975ac4a5fdee8cb561f0f01f74e350a0ab455442f67' 
  AND token = 'lN6sIN90oMmL4WfdZRHZ/LB0MmYT9y4K9sWbQ4kasH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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