Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e064faedc598be4523a302abfa3691e264d8f6afbf23ab7f8a278b3457d8e0' 
  AND token = 'JR4RP/ijKP0znZbh/nrcvxMe27oHwiruTaZM36Y+mmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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