Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348c204d486f75257948d02102c52d5734b21157108628483420caf339a9345d' 
  AND token = '/LDswfDfjlwlOSs/j1rY0N4ZSzydfHjCh8qsHzD6UYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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