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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '491822055df1b3ddc889364d793d9926c43f570bdb860923e709f188fe6860f8' 
  AND token = 'Jr1fV8QtppBPy07SIA6nuKD+FAb1E5Sof7nwnAL7J78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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