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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32d1e8a774cbae3cff1465062d865c69f1212cc550aad6a926620fc2032b068f' 
  AND token = 'CDheqt7bqZD/NkY2CoofCUonIhvVGdmDo/D2WxNOa70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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