Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '780808a3741a7596df7d8c5c80487313d9745e7334c9733a771b68ad47bffcc6' 
  AND token = 'gkz/hzhNxUrHxaqXupLBOVuJV8hLnM1rgTrWZhXEXc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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