Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9a7874928288ec0d7a7a04dd92f77ea5c90d64e7fb919354c0a2e5c9efcd8d' 
  AND token = 'U52JYGjpurWvlkguVJ+y9N0XESsxazRsLHFAGIvx7ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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