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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f484a0c8010354cc7f3432ff6548d84a66d1af8f17a2e0fc6082c8c8026727a2' 
  AND token = 'ma9r+WkdkSrP5QWxROUNgBn9JiV1XIY+6xABCVisMqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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