Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2a98f32e6dd6ec528fdaf933db991c6c2289fc1e776ab3380187ecf1491e35' 
  AND token = '6jQrtwGChShiLa06dEuS/xaPyqZYOQLfRBi6xyQsnd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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