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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8de6e2755324302a5f7f98bb496bdbe97a5c60bcef73f68feeb834ceb561a8b' 
  AND token = '5yzz+5+Sh7YraqwCmLia2DLit6VAP+/Xc+1WD54KyyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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