Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463cb8df95f1e1830dcf94b280e961154db4988ec1bdc54e8d2e90585c60b704' 
  AND token = 'AincjDtdpudUQSeykLry84pPOFrVDT28Z8Kp7y+3RWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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