Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b749e2a87267533c0d85736785c7bf6d55a0dc0bc6b57aecba209fcce1bab464' 
  AND token = '5d/pvBhR7etEoWOx7qyEntIF3H38Zyas2eevHNwD6x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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