Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bc8719501ab7e42ee56f1b1ea607b05eb21b9842882a54d4a9ca0240c643f2' 
  AND token = '1x3thulkJnZsYn7byYSLyoGh17zKHcgHfsbhTyLCSa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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