Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136df3967bb7320e950f959d737793f55e189b01f780111c2bd36b74a4ca311c' 
  AND token = 'cdqln3bQVq9CpY6ke9U7a9eMjr9s5KTj8EWuyrPcLkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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