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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c3eb3fe36f92dc8b14f469f76fe9d1410d873cb8b0150bedf1baf294cf8c23de' 
  AND token = 'p3iSR0TIG2HQ+I70X3kU+oIpZbs8qbE+egitz9T6ilE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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