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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c207d12bb8003a785264359c1e51d3e8c6dc06ecad95b158309f4d106a11673d' 
  AND token = 'ehXxuLVJNDJgUVAiNNRB2De1vcuugI9u9O6Glipfxnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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