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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8026de40332b2084a41babc6d6a5fa45814b63a3b6710e9175b19394f6b26a38' 
  AND token = '6MGuX60MaNvLfu56pcPhUb0L90sFUFKTFfhiYvshCc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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