Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf28176c84f7b40ec73e1eca0d4f6633603a22ba4a3d6790b54c45dffb426ad7' 
  AND token = 'eTKfE/QmnJ17gQY0UgfRrEinsyUSMIXLrGuAxsdz3ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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