Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489d68291c28a0bba2d29064d3030a1a9bee98cbe6b03e68bf90199eca460f51' 
  AND token = 'eJQMf20okplzOh9B1pGiIUTuwuusjaoTG4uU5P8J36A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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