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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2879b3d290f2ea9362f408ea55ad00632c130f44c7d4de02ba9bb940472eed22' 
  AND token = '5mOmJ2wLnqIbwR4U6FUsEY6qyn3kdjod4eadH3GEDsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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