Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b304017334d8ed6d015a7f7597d7884f540daa44dee501132e5bbcfc52666f8' 
  AND token = 'MnO9nMI4lgf3nl54G226hhwmlGKTh+Wnr6fQqykl9yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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