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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d7a3ee4cf718d60e56fd1e69afe69238aee5ae81880f68bef1a2f0dea4102e8' 
  AND token = 'Ei4riicBuYq7mBRRagvm3IY+3+f76JsWax1ikbJ7atc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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