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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2d0c00d2d5a48d410a9f8556e4a2b81e9a1ea2951bbdef6d5c03332db514e424' 
  AND token = '108+VSxnTgcHgkOmYSkWvRhCR/1jgJ9WdmzocqToR0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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