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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7fb468a60811e1ae2a4dde93abac512c876907702e2908f2119936bbfce2107e' 
  AND token = 'GQ8kf+yC3/mMreLO/zbVFORceR7ijRaetlD+7a1XtYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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