Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3dd9468e27ac909f5a72e4bc5ee2abf1f8521dc2cb8597243bea38d029fd9a1' 
  AND token = 'g9mcVLRKvBTE8t/psZ7g21S0TiYO9ZpTUFZQcjsMFqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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