Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dea196c02387bd6f9c67d1aa123ef737ac6e77921af8168a83067e23cc6f59' 
  AND token = 'Uo7PjGqgwS+wD3wq9azqwoLiT3vn1fPDVEW5V9u5lm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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