Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8711232bd2e7943aaf61c3bf87b49dc23d38142aa3c6cbc567a271a758ded1' 
  AND token = 'GrIgIC6iT2HwL9ZZjWXLuh7pEh1nQgvEDwO5WkJLT9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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