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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3929073f506a19f30b12deabf5e966ea12673eed34a54d25e75480dbf2659a33' 
  AND token = 'sx6mz3/eFUu6pBCLIvWg+WRgYlxMMSW2lsQBkUs6VXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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