Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea69454289c073b6bf0e3c4dc9cd270e1a8ff1cf6ca9c2e9add2f5fd0ed2131d' 
  AND token = 'RmqY0k1EX1faEvVJ6bVIQQRdT++xqrixVq1hAuB+Ddg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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