Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e623c1520546f0448fa8e206d3712b14d467e9f1189408363c7c85ab83f1cf8f' 
  AND token = 'qkLk2v+884j2ElVLSYPBTa5XiHTwytH4fL5mMIsUgTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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