Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e540fc3894722950fe4b5c94ce4960f0defe1502963203d530f43fe6f483c205' 
  AND token = 'BeGJK5z1yMUSl5gOTiLvnxIZjBpMrwVjNTbQ3372Y9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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