Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4615303d8a75cc2cd1dde7e824684e356928de1a7a2685f069773290ea1ee2d3' 
  AND token = '/jdvQcGHpqV9uT3OEZR2ZzWTPQpM5IdZmUDTfoyEqpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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