Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb342d50b3e479f5a753cb6698325d2a0f07d28b2e3dfdbc9c5ad44fa1a4b264' 
  AND token = '2g+ui3aPb6dEfGzb3V4oUIgn/iXmrjh9iouc/JsQf04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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