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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01a5b390f334ee19ef89a1ea9ed8495732849ff923c9935004faa8585dd721a0' 
  AND token = 'uERt3Gcb4Q6/3rBrnMeBbO8S1PKtTOIeMwKAti8QOyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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