Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9736c55aedf2775bec73a3b1996cfe427708ef7239350474cb3f426fa20b8c14' 
  AND token = '5EYZIehskRtm6+vZwUEghN64wgHsNhvTkHNiDKoJmiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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