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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '82b46d0ca225ff5d3f6faa9ff12b50f94136f9b52899f21f863fa745342a107b' 
  AND token = 'rtcoQF3ONhmQaknnuRUtQsj8JEWPTLpaqXhgI7u8ECM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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