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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '010732ffc8adcbec850eed80c09ec188b7c99022b54d9b054f4bbda01c0ff905' 
  AND token = 'C6JnYXODItaKVWW2MWO88BBABldGu5Gssea+9hNkBNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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