Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c505b11e4c63c931058208ccf9847f5625e69d390b5505661f085c592aeb64' 
  AND token = 'StiO0W6VBiT/o3JdKGIwWhMeck8HGD6fdvcEdCp8Il0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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