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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47fc4f79166b8bfa93b64ea680b5e164a5b19628f37a4eececa404b95e92a887' 
  AND token = 'KgLSb2N85jnfRA8qJfPCUd+NM4r9+afcFdgY6Qz0p1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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