Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb43ad6bd8b7527fcdfcf35971a722422df68833f8db39ba7bc359305080dfbc' 
  AND token = 'N/nWLU1qAeDzyN4+uSubMuodX0PitAwL3QnMIUWqjbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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