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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7dc514a88c4e93cf712fb81c66c6152bfa6ead52efa08792f904fdfac537d1f4' 
  AND token = '7d63OLI8DKxn9g0GV37wu5G6XaeTh32jpaCzJqPFkyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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