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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ce161933907628f3c2326771aad391018133d43ed5269bcb7a6a51e27e8fb0e' 
  AND token = 'e0DiiNjyqTMzCBYIzYXu3OCPPi2KhFW1/33juE0mECk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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