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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e467d2023a6eae5a104922d9838ff894062b0ad19aafd09621995f17b9f2da06' 
  AND token = 'aE2cFRB1cdwYfIfhddw76Vg5swytkQZnbFpHjW8e66Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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