Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd6b2b7fa87e67f12b703818d2b378f42bda4a7a4fd28360b9688ba98607bb5' 
  AND token = 'lTROvZARROgbbxk7cp2Rb+Cfl3lDEFyY6miy+Oi2GaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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