Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedf24bb8bf870b0d1fea6a96b5d091ad2d87ea58cb8159f4e45c90feac1af51' 
  AND token = 'DDclWGuXtdGJqqkXsqxnT8jT2up9WmgR8nbAOOVYFkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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