Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8e349b07e11e79a163dd906f11fea3734b91fc2873a19ecac548bacf4ee325' 
  AND token = 'FPCOhE3UzQoWlgVvZSpWVhvxVyMgMIivCPeW2zDC+Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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