Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e447ed6327b1dde796cd79c95b30234393a9d15a6045229dc2e57cb2ffacf6' 
  AND token = 'IKsi6jB4LBWzcQbCK70ZPu2dEQgM824ehPd1g+zQdMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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