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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69926599f840cb0392fa0d9438a2ce675e8b476d559f66393a984d20429713db' 
  AND token = '4t1ew8XCaGj4n0ZW1x0otMY0oKNf87x6sZ5GFdbcdWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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