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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f2bf350a6f43ff029c1793ab079d90a2d328064e1b1c99468dbc788d91133c0d' 
  AND token = 'kpL1Z0/tYfq47IrlKbZXldbfLCU19Y3wh3gkWMUpsp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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